Variable-stroke mechanism.



J. PIERCE.

VARIABLE STROKE MECHANISM.

APPLICATION I1LIJDAPR.23. 191s Patented 001;. 6, 1914.

2 SHEETS-SHEET 1.

WITNESSES.-

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VARIABLE STROKE MECHANISM.

APPLICATION PILIIDAPR.23.1013.

1 1 12,832. Patented Oct. 6. 1914.

2 SHEETS 52111111 2 WITNESSES: INVENTOI? z7o sc 0/z Pzrce Josnrn rmgson, or rmtannnrnm, rnmzs z nvama; AssIeNon-"oronenamro- T flllnqham, it. magma-Mean:

zen of the United States,

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e it;known that I, ,losnrnJBmnen, a.citil ounty. an ylvanie,..havei nve ed. e l mpr men n1v Yugablerstroke. bi hi h ollowmg tall,

Y clear, and. exact descriptiomflrefereme beg Imp , proved in had; to the accompanyin drawings, w ichiorm apart of thissp'eci cation.

The objectsof my; inventiondsto. IOYldfi 1;ove d var able stroke; mec anism, whish lscanable of general. application, but which .is,;par ti cu1arl yapted :to the purpose. of. vaqingtm stroke 0 the piston. 0 an e. f rexample,

will be-uniform. atall adjustments.

Lha'ydshdwn the invention-as applied to a set of four cylinders, although it will be understood that the invention, when a )plied to internal. combustion engines, is capa 1e of embodiment in a single cylinder or in any number of cylinders.

Inthe drawings: Figure l is an end view, principally in vertical section on the line 1.-l of Fig.2, of an engine showing my 1mvariable stroke mechanism arranged to vary the stroke of the pistons. I Fig. 2 is a front view, principally in vertical section on the line 2-2 of Fig. 1. Figs. 3, 4, 5 and 6 are diagrammatic views showing difl'erent adjustments of; the mechanism for varying the stroke of the piston.

The four cylinders a,'-a, etc.,arc shown arranged in pairs, each having a piston I) to which is pivoted a piston rod-c. To the wrist pin d of each piston rod ispivoted a connecting rod 6 and a stroke-regulating'arni The connecting; rod is connectedto a crank on the crank-shaft f, while the arms 9 connected to the several wrist pins are pivoted on the stroke-regulating rod h.

.Between the pairs of cylinders and on the outside of each pair are studs or pins 5,

. from which are hung arms or hangers 'z, 1.,

and a quadrant or hanger l, carrying the rod h. The quadrant Z car'rles a rack in, which is engaged by a hand-operated worm m. A "easing n secured to the cylinders. carries the studs j and the bearings for the crank shaft, and inclosesthe crank-shaft, the con- Specification of napalm Application nee a riiza, 191a, semi no. 763,093.,

residing at Phila i 'Phi ade1nh1e,.'and Stat n w and.

ofian internal combus n n-mem ;ms shame mer h tthe cl ar.-

anceat. the end of; the, compression stroke WESTNEY; FREDERICK W. IIBWBENCE; ADOI/PE SQH'WAMZ', ALL OFPHSELA DELPHLH, PENNB'ILVAN-IA'.

Patented-Oct. c; 1914..

. necting. rods, the stroke regulating arms, the

. quadrants and the' strokerregulatmg rod.

Thevalve mechanism is not shown, the sameformingnopart. of my invention; 'By. reference. to the. di ams, Figs. 3, 4, 5 and.6,'the operation of 'e stroke varymg ,deyices' will he. understood. The space be-' tween the two lines :v-zv and y--g at the top of. each figure indicatesthe clearancebetween, the head oithe. cylinderfand the pis- ,tonat; the end of each compression stroke. In Fig i 'ositio'n. that the piston-will have its mini -mum stroke, say about two and one half inches, theqpiston being shown as at the has. been adjusted-to. such osition that the piston will have a stroke 0 medium length, say about four inches. In'Fig. 5, the-rod h has been adjusted to such- K'iston will "have a' stroke 0 about sixand a 'alf inches. In Fig. 6, the rod h has been adjusted to such osition thatthe piston will have its'maximum' stroke'fsay about eight and a quarter inches. Thus, by the of all the isto'ns may be fixed at any predetermined le'ngth, but without affecting the clearance between the head of-the cylinder and the piston at the end of the compression stroke, which is a constant factor.

l-lavingi-now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. The combination, with a reciprocating element and a crank shaft, of a strokeicgulating rod, a connecting rod connected stroke-regulating rod, said connecting rod and arm pivoted at a common point on the tions, thereby varying the stroke oflthe reciprocating element.

'12. The combination, with a reciprocating element and a crank shaft, of a stroke-regthe crank shaft, j an arm pivoted on the stroke-regulating rod, said connecting rod and arm pivoted at a common point on the ingthe stroke-regulating rod. and turnable on an axis coincident with the point of con- 3, the. rod .h hasbeen. adjusted to suchposition that the simple rotation of a worm shaft, the stroke" with the crank shaft, an arm pivoted on the reciprocating element, a quadrant suspend-- limits of: its stroke. In Fig. 4, the rod 71..

"reciprocating element, and means .to adjust. the stroke-regulating rod to difierent posi-g.

ulating rod, a connecting rod connected with I nectidn betw n said reciprocating and con,

necting' rod :1 d arm when the reciprocatin element is at onelimit of its stroke, an

- means to-adjustsaid quadrant onits axis,

eating e1ement. 1 4 l 3. The combination, with areciprocating thereby varying the stroke o'f the reciproelement. and a crankshaft, of a wristpin ,.OI1 the reciprocatiug. element, a 're'lativel 'fixed'stud whose axis iscomcident wit that of the wrist pin whenthe reciprocating element is at one: limit of its stroke,

aquadran't pivoted on said stud, a sti'0ke-' regulating rod carried by i the quadrant, a connecting-rod connecting the wrist pin and crankshaft, an arm fconnectingfhe wrist pin and stroke-regulating 'rod, and means to adjust the quadrant on its pivot, thereby varyingthe'strokebf the-reciprocating element.

- 4.- The combination with a crank shaft "and a reciprocating element including a pivoted rod, of a relatively fixed stud, a

quadrant pivoted on said stud, 'two connect.

.ing rods eaehpivotedat one end on a com; mon axis. on said pivoted rod, the other end of one connecti .-r0d beingconnected to the crank-shaft an 'the' other end of the other connecting rod being pivotally connected to said quadrant, a rack on the uad* rant and a worm engaging said-rack, w ereby tlie quadrant may be adjusted to vary thedistance between said stud and said common axis when the" reciprocating element --is"at fone limit ofits stroke.

5. The combination with a crank shaft and a reciprocating element including a piv 'oted-"rod, of a vpivoted quadrant, two connecting rods each-pivoted atone end on a common axis on said pivoted rod, the other end of one connecting rod being connected to the crank shaft and the other end of theother connecting rod being pivotally connected to said quadrant said axis and the being sofrelativ'ely pivot of'the quadrant positioned that they coincide when the reciprocating element is at one limit of its stroke, and means to adjust the quadrant on its pivot, thereby varying the distance between said axis nd the pivot of the quadrant when'there .iprocatmg element is at ciprocating element 8. The combination of 1 connecting rod connected with the crank the other limit of. its stroke; whereby the Q stroke ofthe reciprocatirigjelement may be varied. H 6. The combination of acrank shaft and a plurality oi -reciprocating elements, offa plurality of hangers, pivoted on a common axis, a stroke regulating rod carriedby the hangers, connecting rods connecting the several 7 reciprocating elements and the crank shaft, arms connecting the several reciprocating elements and the stroke-regulating rod, and means to adjust the hangers to red, thereby varying the stroke of the several reciprocating elements.'

' 7. The combination with acrank casing, a

a wrist'fin on each rod, studs carried by the casin'g, the axis of said studs being covary the position-of the stroke-regulating crank shaft, and a plurality of re'cipr'ocating elements each including a pivoted rod,

incident with the axis of the several wrist.

'pins when the reciprocating elements are at i one limit of their strokes, hangers suspended from the several studs, 9. stroke-regulating rod carried by the hanger, arms connecting the several wrist pins with the stroke-regulating rod, connecting rods connecting the several wrist pins with the crank-shaft, a. 'rack on one of thehangers, and a worm' en a in said rack and b means ofwhich' g h r.

the position of the stro e-ro ulating rod may be varied to vary the stro lre of the rea crank shaft, 11

shaft a reciprocating element and a'stroke- "regulatinp arm, said rod,'.arm and reciprocating'element buying a common. pivotal connection, T means" by "which said arm is 

